Coverity scan badge

[victorusu]

This introduces the Coverity Scan (https://scan.coverity.com) as a badge to ReFrame

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cc38b84) 86.71% compared to head (a21c385) 86.70%. Report is 36 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #3048      +/-   ##
===========================================
- Coverage    86.71%   86.70%   -0.01%     
===========================================
  Files           61       61              
  Lines        12002    12002              
===========================================
- Hits         10407    10406       -1     
- Misses        1595     1596       +1     

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[vkarak]

Also the badge shows as "pending".